Date.prototype.formatDate = function (format) //author: meizz  
{  
    var o = {  
        "M+": this.getMonth() + 1, //month  
        "d+": this.getDate(),    //day  
        "h+": this.getHours(),   //hour  
        "m+": this.getMinutes(), //minute  
        "s+": this.getSeconds(), //second  
        "q+": Math.floor((this.getMonth() + 3) / 3),  //quarter  
        "S": this.getMilliseconds() //millisecond  
    }  
    if (/(y+)/.test(format)) format = format.replace(RegExp.$1,  
    (this.getFullYear() + "").substr(4 - RegExp.$1.length));  
    for (var k in o) if (new RegExp("(" + k + ")").test(format))  
        format = format.replace(RegExp.$1,  
      RegExp.$1.length == 1 ? o[k] :  
        ("00" + o[k]).substr(("" + o[k]).length));  
    return format;  
}  